c语言程序设计，科学计数法的问题
C\u8bed\u8a00\u95ee\u9898\uff0c\u79d1\u5b66\u8ba1\u6570\u6cd5long \u8868\u793a\u53d8\u91cf\u7c7b\u578b long int, \u4e0d\u662f float, \u4e0d\u662f double,
\u8f93\u51fa\u683c\u5f0f long int, \u8981\u7528 %d
double a = 42.321e2;
printf("%lf",a);
\u5c31\u5bf9\u4e86\u3002
#include
double fun(int n);
int main()
{
char a;
double x,t;
int i,n;
printf("\u8bf7\u8f93\u5165\u6570\u5b57\uff1a\n");
scanf("%lf",&x);
getchar();
a=getchar();
scanf("%d",&n);
if(a!='e'&&a!='E')
printf("\u64cd\u4f5c\u6709\u8bef\uff0c\u8bf7\u91cd\u8bd5\uff1a\n");
t=x*fun(n);
printf("%.8lf\n",t);
}
double fun(int n)
{
if(n==0) return 1.0;
if(n>0) return 10.0*fun(n-1);
if(n<0) return 0.1*fun(n+1);\\\u8fd9\u91cc\u6362\u6210+1\u5c31\u597d\u4e86\u3002\u5475\u5475\uff0c\u5e94\u8be5\u6ca1\u95ee\u9898\u4e86
}
包括一个数组（存放前面的数）和一个整形（存放10的指数）。
加减乘除都要自己编写，注意在数组里存的数是字符
printf函数可以用%g来显示科学计数法。
printf("%g\n", v);
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